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Encyclopedia > Eyewall
Eye of Typhoon Odessa, Pacific Ocean, August 1985
Eye of Typhoon Odessa, Pacific Ocean, August 1985

The eyewall is the region of a tropical cyclone with the strongest winds, the tallest clouds, and the heaviest rain. It is the area directly around the eye of the cyclone. The greatest damage caused by tropical cyclones occurs where the eyewall crosses over land. The strongest tropical cyclones have an eyewall that wraps completely around the eye of the storm; storms where the eyewall does not completely wrap around the eye are not as strong or as well-formed. Image File history File links Download high resolution version (640x640, 63 KB)Eye of Typhoon Odessa, Pacific Ocean August 1985. ... Image File history File links Download high resolution version (640x640, 63 KB)Eye of Typhoon Odessa, Pacific Ocean August 1985. ... Kikyo is the prettiest anime girl/priestess!! ... This article is about the year. ... Cyclone Catarina, a rare South Atlantic tropical cyclone viewed from the International Space Station on March 26, 2004. ... Wind is the roughly horizontal movement of air (as opposed to an air current) caused by uneven heating of the Earths surface. ... Cumulus of fair weather A cloud is a visible mass of condensed droplets or ice crystals suspended in the atmosphere above the surface of the Earth or another planetary body. ... Rain falling For other uses see Rain (disambiguation). ... A rolling thundercloud over Enschede, Netherlands Heavy storm brought by Typhoon Sanvu in Hong Kong. ...


Eyewall replacement cycles

Eyewall replacement cycles, also called concentric eyewall cycles, naturally occur in intense tropical cyclones, i.e. major hurricanes (winds > 50 m/s, 100 kt, 115 mph) or Categories 3, 4, and 5 on the Saffir-Simpson Hurricane Scale. As tropical cyclones reach this threshold of intensity, they usually—but not always—have an eyewall and radius of maximum winds that contract to a very small size, around 10 to 25 km [5 to 15 mi]. At this point, some of the outer rainbands may organize into an outer ring of thunderstorms that slowly moves inward and robs the inner eyewall of its needed moisture and momentum. During this phase, the tropical cyclone is weakening (i.e. the maximum winds die off a bit and the central pressure goes up). Eventually the outer eyewall replaces the inner one completely and the storm can become the same intensity as it was before or, in some cases, even stronger. A concentric eyewall cycle occurred in Hurricane Andrew (1992) before landfall near Miami: a strong intensity was reached, an outer eyewall formed, this contracted in concert with a pronounced weakening of the storm, and as the outer eyewall completely replaced the original one the hurricane reintensified. Another example is Hurricane Allen (1980), which went through repeated eyewall replacement cycles – going from Category 5 to Category 3 status several times. Also, Hurricane Frances in 2004 underwent many eyewall replacement cycles on its track towards the United States. This article is about weather phenomena. ... The Saffir-Simpson Hurricane Scale is a scale classifying most Western Hemisphere tropical cyclones that exceed the levels of tropical depression and tropical storm and thereby become hurricanes. ... diurnal (daily) rhythm of air pressure in northern Germany (black curve is air pressure) Atmospheric pressure is the pressure above any area in the Earths atmosphere caused by the weight of air. ... B C D E F G H I 10 J K L M N O Categories: | | | | | ... 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ...


It was the discovery of concentric eyewall cycles that was partially responsible for the end of the U.S. Governments's hurricane modification experiment Project Stormfury, since what the scientists had hoped to produce through seeding was happening frequently as a natural part of hurricane dynamics. Project Stormfury was an attempt to weaken hurricanes by using cloud seeding in the eyewall of these storms. ...


See also

   
Tropical cyclones Portal

Image File history File links Portal. ... Cyclone Catarina, a rare South Atlantic tropical cyclone viewed from the International Space Station on March 26, 2004. ...

References


  Results from FactBites:
 
Eyewall Wind Profiles in Hurricanes Determined By GPS Dropwindsondes (1135 words)
This study is based on a sample of 357 quality-controlled eyewall profiles from the following hurricanes: Guillermo and Erika in 1997; Bonnie, Danielle, Georges, Mitch, Lester, and Madeline in 1998; and Bret, Dennis, Floyd, Gert, Irene, Jose, Lenny, Dora and Eugene in 1999.
Figure 1 shows the mean eyewall wind speed profile, where the wind at each level has been normalized by the wind speed at 700 mb (taken from the dropsonde profile, if available, or from the aircraft 700 mb flight-level wind at the time of launch, if not).
) is 0.78 in the outer vortex and 0.91 in the eyewall.
Encyclopedia: Eyewall (946 words)
The eyewall is the region of a tropical cyclone with the strongest winds, the tallest clouds, and the heaviest rain.
The strongest tropical cyclones have an eyewall that wraps completely around the eye of the storm; storms where the eyewall does not completely wrap around the eye are not as strong or as well-formed.
A concentric eyewall cycle occurred in Hurricane Andrew (1992) before landfall near Miami: a strong intensity was reached, an outer eyewall formed, this contracted in concert with a pronounced weakening of the storm, and as the outer eyewall completely replaced the original one the hurricane reintensified.
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